Grid lines

Learning goal

You will be able to turn the grid on and off in your phone's camera settings and use this nine-box network of lines for three jobs: keeping the horizon and vertical lines straight, placing the main subject deliberately within the frame, and not losing sight of the edges of the frame. You will know that the grid is not a rule but a ruler, recognize the level indicator on some phones, and begin turning the habit of checking the frame at the moment of shooting into second nature.

The question

When you open your phone's camera, you may have seen two horizontal and two vertical lines dividing the screen into nine boxes. Or you may have seen them on a friend's screen and asked, "What's that?" Most people either never turn these lines on, or turn them on and leave them without knowing what they are for. Some even switch them off, thinking they will be burned into the photo.

What are those grid lines for? The short answer: they don't go into the photo; they are only shown to you. They are like the chalk lines a tailor draws on fabric; once the cutting is done they disappear, but they are what make the cut straight. The grid helps you keep the horizon level, keep lines from tilting and place your subject in the frame on purpose. In this lesson we will bring this simple tool into your everyday shooting.

Context

One of the most common flaws in photos taken with a phone is tilt: one end of the sea has risen, buildings lean to one side, the edge of a table has slid diagonally. The cause is usually not a lack of skill but attention being somewhere else. At the moment of shooting, your eye is locked on the subject, on a face or on a moment, and you don't notice that the phone is leaning slightly to the side. Then, when you look at the photo, the whole scene seems to be sliding.

The grid does its job without splitting that attention. While you look at the subject, the lines sit at the edge of your field of view, and when a horizon or a door frame doesn't line up with them, the eye notices on its own. Because the same lines divide the frame into nine parts, they also make visible where the subject stands and what is at the edges. We will talk about the rules of composition later in a separate module; in this lesson we get to know the grid as a habit to build before applying those rules.

Simple explanation

How do you turn on the grid and what does it show?

On most phones the grid is inside the camera settings, under a name such as "grid", "guide lines" or something similar. When you turn it on, two horizontal and two vertical lines appear on the screen and divide the frame into nine boxes of equal size. Some phones also show a small level indicator in the middle of the screen: when the phone is perfectly level, two small marks line up or a line changes color. When shooting down on a table from above, on some phones two plus signs lining up tell you that the phone is parallel to the ground.

None of these lines are recorded in the photo. They exist only to guide you while shooting. That is why leaving the grid on costs nothing. Many photographers turn it on once and never turn it off again; after a few weeks the lines fade from view, but they still let them notice a tilted horizon at once.

How do you keep the horizon and vertical lines straight?

The simplest and most valuable job of the grid is keeping lines straight. When you photograph a sea, a lake or a plain, align the horizon line with one of the horizontal lines. If the horizon runs parallel to the line, the phone is level; if one end pulls away from the line, turn the phone slightly in that direction. The vertical lines do the same job: when you bring the corner of a building, a door frame or a pole close to a vertical line, you see at once whether it is leaning.

There is a detail you need to know here. If you tilt the phone upward while photographing a building from below, the vertical edges of the building move toward each other and the building looks as if it is falling backward. The grid shows this too: the edges aren't parallel to the vertical lines but draw a triangle that narrows toward the top. To reduce this, you can hold the phone upright and take a step back, or photograph the building from a little further away. Sometimes this tilt is wanted on purpose, to make a building look gigantic; what matters is that it is a choice.

How does the grid guide the frame?

The nine boxes make it easier to see where the subject stands in the frame. Putting the eyes near the top horizontal line in a portrait, running the horizon through the lower or upper line rather than the middle in a landscape, leaving space in front of someone walking in the direction they are going: these are choices you can easily try with the grid. In a symmetrical scene, on the other hand, placing the subject in the center box and balancing the two sides can give a strong result. You will see the idea of placing the subject where the lines cross in detail in Lesson 6.3; there, too, as a useful tool rather than a rule.

An often overlooked job of the grid is drawing attention to the frame edge. The outer boxes make visible an unnecessary object, a finger or a half-cut head entering the edge of the frame. This matters even more when you photograph people: phones' wide-angle cameras can stretch faces a little at the edges of the frame and darken the corners slightly. In a group photo, if someone with dark skin ends up at the very edge, in the darkening area of the corner, the detail in their face is the first thing lost. Looking at the outer boxes of the grid and making sure no one is right in the corner is an easy way to show everyone's face with the same care.

Visual evidence

Imagine photographing the sunset twice in a seaside town. In the frame taken with the grid off, the sea rises to the right, as if all the water were about to flow into the left corner. The lighthouse pole on the pier leans slightly to the left. The horizon runs right through the middle of the frame, and the pink clouds above and the dark water below take up equal space. Of your three friends standing at the side, the one with dark skin has ended up in the far right corner; their face has merged into the shadow of the darkening corner and is slightly stretched to the side.

You turn on the grid and photograph the same scene again. You align the horizon with the lower horizontal line; the sea is now level and calm. The lighthouse pole stands parallel to the vertical line on the right. You give the clouds two thirds of the frame, and the colorful sky becomes the real subject of the scene. You bring your friends a few steps inward; all three are inside the outer boxes, away from the corner. Your dark-skinned friend's face now carries the warm light of the sunset, and the stretching is gone too. The same sunset, the same phone; the difference is made by four thin lines on the screen.

Common mistakes

Summary

Grid lines are a ruler that isn't recorded in the photo and appears only while shooting: they help you keep the horizon and vertical lines straight, place the subject deliberately in the frame, and notice objects or faces left at the edges. Turning it on once and leaving it on prevents most tilted and messy frames at the moment of shooting.

Mini assignment

In this assignment you turn the grid into an everyday habit.

1. Find the grid in your phone's camera settings and turn it on; if there is a level option, turn that on too.
2. Photograph a scene with a horizontal line, for example the edge of a table, a roofline or a horizon, first without looking at the grid, then aligning it with the grid.
3. Photograph a building or a tall door first by tilting the phone upward, then by holding the phone upright and taking a step back.
4. While photographing several people together, look at the outer boxes and take a frame making sure no one is left in a corner.

Check yourself

• Did you turn on the grid and manage to align the horizon with a horizontal line?
• When you tilted the phone upward, were you able to see how the vertical edges moved toward each other?
• In the group frame, did you make sure every face stayed away from the corners?

Glossary

Mini quiz

1. Are grid lines recorded in the photo?

• A) Yes, they are always recorded
• B) They are recorded only in night shots
• C) No, they appear on the screen only while shooting
• D) They are recorded only in portrait mode

2. What happens when you photograph a building from below, tilting the phone upward?

• A) The vertical edges move toward each other and the building looks as if it is falling backward
• B) The building looks wider
• C) The building changes color
• D) Nothing changes

3. In a symmetrical scene, which approach to the grid is right?

• A) Always putting the subject on a crossing point
• B) Turning off the grid
• C) Running the horizon through the middle is always forbidden
• D) Placing the subject in the center and balancing the two sides can be a strong option

4. Why is it important to look at the outer boxes in a group photo?

• A) Because people at the edge aren't recorded in the photo at all
• B) Because a wide-angle camera can stretch faces and darken the corners
• C) Because the outer boxes are recorded in the photo
• D) Because the phone doesn't detect faces at the edge

Answers

1. C — The grid only guides you while you build the frame; no line is written into the photo file, which is why leaving it on costs nothing.
2. A — When the phone is tilted upward, the top of the building is further away and the vertical edges draw a triangle that narrows toward the top; the grid makes this tilt visible.
3. D — The grid is not a rule but a ruler; in a symmetrical scene, placing the subject in the center and balancing the two sides can give a strong result.
4. B — Phones' wide-angle cameras can stretch faces at the edges and darken the corners; a face left in a corner, especially on dark skin, is the first to lose its detail.

Summary card

• Turn on the grid in the camera settings; it isn't recorded in the photo.
• Align the horizon with a horizontal line and a building corner with a vertical line.
• Tilting the phone upward narrows the verticals; hold it upright, step back.
• The nine boxes make placing the subject easier; a ruler, not a rule.
• Look at the outer boxes: no one should be left in a corner.

Bridge to the next lesson

You have learned to build the frame straight and balanced with the grid. But when you press the shutter button, a lot of work you don't see is done inside the phone: frames are combined, the sky and the shadows are balanced, the background is blurred. The next lesson opens the door of that invisible kitchen: what does the phone do on its own? There you will see how portrait, night and HDR modes combine several frames, and the limits of these modes.